Room Member List returns "Access Denied"

Experts,

A couple of days ago, we upgraded our portal from NW04 to NW 7.0.

On NW04 we had some collaboration rooms with the Room Member List iView in the dynamic navigation. These rooms were restricted, with public content and some content for members only. The Room Member List was visible for every user, roommember or not.

After the upgrade the same rooms are available and all iViews are working correctly, except for the Room Member List. When a user is not a member of the room, the iView shows an 'access denied' error.

I can't explain why this is happening. The only users who can see the Room Member List, even if they are not a member of the room, are the Administrators and Content Administrators. Since the Collaboration Room iViews are hidden in the Portal Content Administration page, I can't change their permissions.

This error occurs in our development system and in our productive system.

Is there anyone who experienced the same problem, or does anyone have any idea?